Nowadays, many vehicles are equipped with an air suspension system. Unlike traditional hydraulic shock absorbers, air is used as a working medium. The height of the vehicle body is automatically adjusted by the system, and the height of the vehicle body is kept constant when the external road surface and load are changed, and it is artificial. Adjusting the height according to the condition of the road surface increases the road surface passability of the vehicle and achieves automatic control of timely control. The entire body is carried by air, as if it floats in the air, making the vehicle lighter. The types of air suspension are various. Let's talk about the system used by high-end cars.
The principle of exploration | its presence improves the adaptability of the vehicle to different driving conditions
Air suspension:
A height-adjustable automotive suspension system that can be used in conjunction with a controlled shock absorber system.
The existence of the system can realize the height of the vehicle from the ground in multiple modes to adapt to different driving environment requirements.
The presence of the system changes in the payload of the vehicle by adjusting the holding height.
The existence of the system ensures that the wind resistance coefficient is not affected by the effective load by adjusting the height of the vehicle in a timely manner.
The system effectively carries loads so as to reduce the wear rate of the tire.
The system effectively ensures that the front wheel camber does not change with the change in payload.
Exploration principle | system adjustment height
The system achieves three height adjustments:
- Normal suspension position,
– High suspension position for poor road conditions or uneven road surface, 25mm higher than normal, for poor road conditions
– Low suspension position, set automatically when driving on freeways. 15mm lower than normal. The driving height is automatically selected according to the vehicle speed (while traveling on the expressway), and the deselection is automatically performed.
Exploration principle | System composition
System work to achieve: multi-sensor data acquisition
The shock absorber control system records the road conditions and the movement of the vehicle through four wheel acceleration sensors and three vehicle acceleration sensors. The characteristics of each shock absorber are adjusted according to the calculated value of the vibration damping requirement.
System work to achieve: level adjustment.
The system automatically adjusts the vehicle's level based on feedback from the vehicle's sensors. When the vehicle changes altitude in a specific situation, it is necessary to turn off the leveling work or enter the system lift mode, otherwise the system will work abnormally and cause damage.
System work to achieve: "Hook control strategy" to adjust the damping force.
The shock absorber is adjusted based on the vertical acceleration of the wheel and body. In an ideal state, this damping control looks like the body is suspended by a hook in the air floating on the road without any interference movement. In this way, maximum driving comfort can be achieved.
Air supply unit
Compressed air is produced using a single-stage piston compressor with an integrated air dryer. The compressor uses a so-called dry running compressor design
Acceleration sensor
Wheel acceleration sensors are mounted directly on the air spring struts on the front and rear axles. They measure the acceleration of the wheel.
Leveling system control unit
The height-adjustment system control unit has an additional processor (dual processor); the operation of the air spring is mainly performed on the first processor, and the vibration-reduction control is mainly performed on the second processor.
Height sensor
The vehicle height sensor is a so-called wheel sensor, and the amount of change in the height of the vehicle body is recorded and converted into an angle change amount by the motion linkage lever.
Oil Casing
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